New patch for new_enemies mod compatibility

Fixed a bug where spell drops from superior monsters were not respecting the spell's unlock condition, causing the player to see spells they shouldn't yet.

Fixed a bug where rage-fueled levitation would not correctly replenish flight energy because of the level bonuses not applying

Removed a line of code I forgot I added that would definitely be causing people errors. How does this keep happening?

Compatibility fix for possibly several mods which add spells

Enemies which become superior will now also have their CameraBoundComponent removed, stopping them from being deleted. The enemies still seem to disappear if you get too far away and will reappear when you are close enough.

To prevent the world cache from filling up with enemies that will not be seen again possibly ever, there are restrictions as to when the camera component is removed. Such as when the spawn probability is too high for the player to care about the enemy being lost.

Fixed a bug causing some spells not to drop and also sell for no gold if tried.
Selling spells now announces how much gold they give.
Changed default for setting "level difficulty scale B" to from 0.1 to 0.045.
Changed default for setting "ease of level" from 0.1 to 0.25.
Settings are now labeled to show whether they need a new game started in order to take effect.

Changed the default level balance settings. These changes won't reflect for anybody who already had the mod installed.

Config menu defaults changed:
-Ease of level: 30.0 -> 0.1
-Level power: 1.0 -> 5.0
-Diminishing returns: 0.9833 -> 0.9
-Level difficulty interval: 100 -> 1
-Level difficulty curve B: 2.0 -> 0.1

Mistake patch - realised I had not saved the file I was modifying as I was performing the mod upload.

Fixed silly division by zero error which was just crashing the game when starting a new run with Varia's addons mod also installed